Hello Why is it, that the wait and timed_wait functions of the condition_variable class do not encapsulate the problem of spurious wakeups? I wonder whether there are good reasons. I have seen libraries which do so. Do they miss a corner case? For illustration here is a sketch of a wrapper class ---8<--- class save_condition_variable { public: save_condition_variable() : waiting(0), wakeup(0) { } void notify_one() { if (wakeup < waiting) { ++wakeup; } cond.notify_one(); } void notify_all() { wakeup = waiting; cond.notify_all(); } void wait(unique_lock<mutex>& lock) { ++waiting; do { cond.wait(lock) } while (wakeup==0); --waiting; --wakeup; } bool timed_wait(unique_lock<mutex>& lock, system_time const& abs_time) { ++waiting; bool res = true; while(wakeup==0 and res) { res = cond.timed_wait(lock, abs_time); } --waiting; if (res) --wakeup; return res; } private: condition_variable cond; int waiting; int wakeup; }; --->8--- Having the spurious wakeup problem handled by the library is a significant increase of comfort for both developers and maintainers. regards Alex